<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <div ref="node">
            <div v-for="item in list">{{item}}</div>
        </div>
        <button @click="add">点击</button>
    </div>
    <script>
        let app = new Vue({
            el: "#app",
            data() {
                return {
                    list: ['蜘蛛侠', '钢铁侠', '闪电侠', '猪猪侠',]
                }
            },
            mounted() {
                console.log(this.$refs.node.clientHeight, "列表高度");
            },
            methods: {
                add() {
                    // push的动态，以外修改数据
                    this.list.push("蜘蛛侠")
                    // vue的特点：渲染节点是个异步的操作
                    // 获取出来的高度是在渲染了dom之前
                    // 如何解决：获取数据更新后的dom节点
                    // nextTick()
                    // console.log(this.$refs.node.clientHeight, '列表高度');
                    this.$nextTick(() => {
                        // 获取数据更新后的节点
                        console.log(this.$refs.node.clientHeight, "列表高度");
                    }
                    )
                }
            }
        })
    </script>
</body>

</html>